Think About! He has a artificial heart and after being turned into a kid he should have regenerated a new human heart. Since you can't have two things in the same place at one time his proper response once the beam effect wears off should have been to to keel over instantly like Jackson( I think that was the name) in the TOS Halloween episode. Or worst since his body wouldn't have been put back together he should have yelled out like those poor Transporter people in The Motion Picture" and turned into whatever it was they were turned into.
Jason
Jason